Mr. O’Hara has developed a test of mechanical aptitude. At the beginning of a course in auto mechanics, he gives this test to his students. At the end of the year, he compares students’ scores on the test with their actual achievement in his course. What is he probably trying to find out about his test?

It's predictive validity.

Step-by-step explanation:

Predictive validity is the extent to which a score on a scale or test predicts score on some criterion measure.

-Mr O'Hara aims to establish the the students' long-term  performance in the unit auto-mechanics and then seeing if the scores will be correlated to future performance in that specific unit.

use this formula:

p(a\b) = p(a and b)/p(b).

take it from here.

salary

step-by-step explanation: